diff --git a/a8/mutable_xobject.cc b/a8/mutable_xobject.cc
index db2f3ef..7e48f5b 100644
--- a/a8/mutable_xobject.cc
+++ b/a8/mutable_xobject.cc
@@ -53,6 +53,17 @@ namespace a8
         return *this;
     }
 
+    a8::MutableXObject& MutableXObject::SetVal(const std::string& key, a8::XObject& val)
+    {
+        if (type_ != XOT_OBJECT) {
+            abort();
+        }
+        std::shared_ptr<a8::XObject> p = std::make_shared<a8::XObject>();
+        val.Move(*p.get());
+        (*value_.object_value)[key] = p;
+        return *this;
+    }
+
     a8::MutableXObject& MutableXObject::SetVal(const std::string& key, a8::MutableXObject& val)
     {
         if (type_ != XOT_OBJECT) {
diff --git a/a8/mutable_xobject.h b/a8/mutable_xobject.h
index f7baa58..3f542bd 100644
--- a/a8/mutable_xobject.h
+++ b/a8/mutable_xobject.h
@@ -17,6 +17,7 @@ namespace a8
         a8::MutableXObject& SetVal(int i, a8::XValue val);
         a8::MutableXObject& SetVal(int i, a8::MutableXObject&& val);
         a8::MutableXObject& SetVal(const std::string& key, a8::XValue val);
+        a8::MutableXObject& SetVal(const std::string& key, a8::XObject& val);
         a8::MutableXObject& SetVal(const std::string& key, a8::MutableXObject& val);
 
     };
diff --git a/a8/sysutils.cc b/a8/sysutils.cc
index 3935880..4076ac6 100644
--- a/a8/sysutils.cc
+++ b/a8/sysutils.cc
@@ -1,6 +1,9 @@
 #include <unistd.h>
 #include <sys/time.h>
 #include <sys/stat.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <memory.h>
 
 #include <a8/a8.h>
 #include <a8/sysutils.h>
@@ -117,10 +120,37 @@ namespace a8
     bool MkDir(const std::string& path)
     {
         if (access(path.c_str(), W_OK)  == 0) {
-            return 0;
+            return true;
         }
         int status = mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
         return status == 0;
     }
 
+    void ForceCreateDir(const std::string& path)
+    {
+        if (access(path.c_str(), W_OK)  == 0) {
+            return;
+        }
+        std::vector<std::string> strings;
+        a8::Split(path, strings, '/');
+        std::string cur_dir = "/";
+        for (auto& tmp_str : strings) {
+            cur_dir += tmp_str + "/";
+            if (access(cur_dir.c_str(), W_OK) != 0) {
+                a8::MkDir(cur_dir);
+            }
+        }
+    }
+
+    std::string GetIpAddress(unsigned long ip_saddr)
+    {
+        in_addr addr;
+        memset(&addr, 0, sizeof(addr));
+        addr.s_addr = ip_saddr;
+        char buf[255];
+        buf[0] = '\0';
+        inet_ntop(AF_INET, &addr, buf, 255);
+        return std::string(buf);
+    }
+
 }
diff --git a/a8/sysutils.h b/a8/sysutils.h
index 8f1adef..c4bcdc5 100644
--- a/a8/sysutils.h
+++ b/a8/sysutils.h
@@ -61,6 +61,8 @@ namespace a8
     bool HasBitFlag(const long long& flag_bits, int bit);
     void XPrintf(const char* fmt, std::initializer_list<a8::XValue> args);
     bool MkDir(const std::string& path);
+    void ForceCreateDir(const std::string& path);
+    std::string GetIpAddress(unsigned long ip_saddr);
 
 }